Low pass filter for subwoofer

Description.
Many low pass filter circuits for subwoofer are given here and this is just another one. The circuit given here is based on the opamp TL062 from ST Micro electronics. TL062 is a dual high input impedance J-FET opamp which has very low power consumption and high slew rate. The opamp has excellent audio characteristics and is very suitable for this circuit.
Out of the two opamps inside TLC062, first one is wired as the mixer cum pre amplifier stage. The left and right channel are connected to the inverting input of IC1a for mixing. The gain of first stage can be adjusted using POT R3.The output of the first stage is connected to the input of second stage through the filter network comprising of components R5,R6,R7,R8,C4 and C5. The second opamp (IC1b) serves as a buffer and the filtered output is available at the pin 7 of the TLC062.

Sir,
I am new in electronic field. I want to build a subwoofer amp. I made a 150w poweramp for subwoofer using +35/-35v 5amp dual power supplay. Now i have a doubt. If any problem can i connect the filter circut to the 35v 5amp dual power supplay? Please clear my doubt sir. And give me a solution to overcome this limitation. Iam hoping ur replay. Please help me… Have a good day..

sir I built both 100 watt subwoofer amplifier and subwoofer filter but nothing works. I built subwoofer filter using 47k fixed resistor instead of pot and I connected to a sterio amplifier (I don’t know power of amplifier) but nothing come out please help in building both circuits I spend nearly Rs. 2000/- for this circuit’s component. thankyou.

Hi for R3 you can use a preset as it is meant level, if you are going to use only the same input source always. R6 & R7 should be a ganged pot or you can use 2 identical presets adjust them in similar fasion such that they operate like a ganged control. you can attach both the presets with a thin non conductive shaft.

The PCB shown in the link alone I have used. Philips single (for level) & stereo (for shifting the cut off frequency) PCB type controls will suit the PCB and layout. No need to wire Pots as they are connected through copper prints.

sir im an enthusiast bout electronics .favor please sir please do mail me tthe more detail schematic of this low pass filter sir? with the values of each capacitors and resistors used? it means a lot to me sir if you grant my asked favor.thank you in advance

Hi, i made this filter and it works perfect! I’m really happy with that. But i had to change R1 and R2 in to lower nominal couse it plays very quietly. I change to 4.7kOhm and than everything worked fine. Thank you!

Hi Pankaj IC1a is used as a gain controlled buffer amplifier. IC1b is used as an active tunable low pass filter in the very low audio frequency area(with R6 & R7 filter charesterestic can changed a little.
You can use an universal board (staight line vero boards or connecting perforated dotted boards suitably)

Hi Alam through an 100K volume control you can feed the output of this filter to any high power amplifier.
Hi Abhinash you have to connect the output through high power amplifier to the speaker (sub woofer)

common man, need help !!! I saw this Circuit on the web which i
was searching for kind of one
for a long time and unfortunetly there
are some mismatch between PCB,
Data Sheet, Built PHOTO posted. i really
need this circuit so, looking for help from you to understand the
Circuit and need its working
DIagram http://www.free-circuit.com/
subwoofer-filter-gainer-auto-power-
system-circuit/

I saw this Circuit on the web which i was searching for kind of one
for a long time and unfortunetly there are some mismatch between PCB,
Data Sheet, Built PHOTO posted. i really need this circuit so, looking
for help from you to understand the Circuit and need its working
DIagram

Hi Rupjyoti you can use TL072 or TL082
TL062 confirms to Military specification can work down to 4volt ( +2 & -2)
TL072 confirms to Industrial specification can work down to 7volt ( +3.5 & -3.5)
TL082 confirms to General Purpose use can work down to 12volt ( +6 & -6)hence for our use this is quite satisfactory